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WAEC Biology 2020 Question 19

Question 19

Sense Organs

What happens when the ciliary muscles of the eye contract? The

  1. A.lens becomes more concave.
  2. B.lens becomes more convex.
  3. C.lens gets a longer focal length.
  4. D.suspensory ligament becomes tight.
Show the answer and explanation

Answer: B (lens becomes more convex.)

Explanation

Contraction of the ciliary muscles slackens the suspensory ligaments, so the elastic lens becomes rounder (more convex). This is how the eye focuses on near objects.